Internal-combustion engine



PATENTED AUG. 11, 1908.

C. O. HEDSTROM. INTERNAL COMBUSTION ENGINE.

APPLICATION FILED OUT. 30, 1907.

2 SHEETS-SHEET 1.

No. 895,754. PATENTED AUG. 11, 1908. G. O. HEDS TEO'M. INTERNALCOMBUSTION ENGINE.

APPLICATION FILED OUT. 30, 1907.

2 SHEETB-SHEET 2.

UNITED STATES PATEN T OFFICE.

' OARL- o. HEDS'IIBOM, 0F SPRINGFIELD, MASSACHUSETTS.

INTERNAL-COMBUSTION ENGINE Application filed October 30, 1907.: SerialNo. 399,862.

Specification of Letters Patent.

Patented Aug. 11, 1908.

To all whom it may concern;

Be it known that I, CAR O. HEDSTROM, a citizen of the United States ofAmerica, residing at Springfield, in the county of Hampden and State ofMassachusetts,- have invented new and useful Improvements in Internal.-

Combustion Engines, ofwhich the following exhaust valve of the engine,also showing a ortion of the crank casing broken away for illustratingthe cam-operating mechanism.

This view shows both t 'e exhaust and inlet.

valves closed. Fig. 2 1s a views'imilar to Fig. 1 but showing only theexhaust valve open, the cam for o erating the same being in one osition,and ig. 3 shows a view similar to' i 2- but with. the exhaust valveclosed an the inlet valve open, the cam for operating the valve being inanother posi-- tion.

Referring to the drawings in detail, a desi ates the cylinder oftheengine; b the crani casing;- c the cam shaft to which is secured thevalve-operating cam d. Pivotally secured to the crank casing b at thepoint e is a cam lever f the lower side of which is providedwith anantifriction roller g. Located above the cam .lever f, and looselymounted in the frame of the machine is a rod h, the upper end of whichengages a' socket h in the arm t which is made integral with the lowerend of the inlet valve operating rod j,

as shown. I v

Loosely mountedln an o enlng 1n the arm 1'. of the rod 7' is a rod in tat engages at its up er end an abutment 7a.. Encircling the ro 7c is aspring m which is normally placed. under compression, its lower endengaging a shoulder portion m on-the arm '5, and its u er end engaging ashoulder m on the rod he action of this spring is always downward 80that the rod 7' will be operated when the which both of said valves maybesmall Space, designated by y.

rodh is permitted to fall, as will be'fully set forth in describing theoperation of the invention. The upper end of this rod isv curved inwardat 0 and has mounted in the is provided with a lock-nut q so that aftered in the plug 7 is a loosely fitting pin q. When the rod rises, asshown in Fig. 2, the

upper end thereof an adj ustable'screw 12 that ad uStment of the screw30 the'same may be ,locked securely to the rod Loosely mountend of theadjustable screw 1) will leave the upper end of the pin q, as shown; butwhen the rod 9' is permitted to move downward, as shown in Fig.7, 3, theupper end" of the in will be struck by the lower end of the a justablescrew v thus opening the inlet valve ,t, as clearly's own in. Fig. 3. Inorder to re,-

duce the friction of the rod 7' during its recip- V \rocating movementsas much as provide an anti-friction roller 0 The inlet valve has itsstem slotted for re ceiving a pin'u which engages the sleeve 0, thelower end of which is of lessdiameter in order to form a shoulderportion for receivpossible, I

ing the expansive spring w. The lower end The expansive spring tonormally holds the inlet valve t closed.

the pinand the adjustable screw. are slightly separated from each otherThe inlet valve t is shown in Fig. 1 in a closed position and the stem 2of the exhaust valve is then extended downwardly into close roximity tothe armi which, as stated, is Elna e integral with the main portion ofthe TO 1 I A spring 3 engages, at its 0 shoul er 4 and a late 5 so t atthis s ring acts normally to old the exhaust va ve'z closed. I Referringnow to the constru'ctionof the earn (1: a curved part. 6 is concentricwith the axis of the shaft 0 and the roller when in contact with thispart, will not rise or-fall. The direction of rotation of the cam disindicated by the arrow 7. Considering the roller g on the lever f as inengagement with the high portion 8 of the cam d the exhaust valve .2, asshown in Fig. 2, will be opened allowing the burned 'ases to escape. The

inlet valve 25 will not e o erated as the ad- -justable screw 19 will beeevate'd above the pin' q, as shown. A further rotationof the It will beobserved that the upper end of I of .this s iiring rests on thebridge-piece m.

posite ends, a

cam (1 will bring thesurface '9 into contact the compression spring mW11 be exerted to move the rody' downward carrying with it the pin g byreason of the adjustable screw 29 in the upper end of the rod 9'striking this pin. The inlet valve 25 is therefore opened and theexhaust valve 2 closed. This portion of the cam (Z is made wav3 in ordertov impart to the roller 9 as easy a motion as possible. Furthermovement of the earn (1 Wlll permit the roller 9 to engage'the surface13 6 whereby both valves 15 and? will be closed,

and during this period of rotation work is being performed in thecylinder. The roller 9 next engages the high portion 8 of the cam afterpassing over the nearly straight sur- 5 face 10 and 0 ens the exhaustvalve 2 as before describec, thus completing the cycle of operations.What I claim, is

1. In combination with a earn-shaft of an internal combustion engine, acam thereon,

a cam-lever as f, a roller as g, engaging the earn, a rod as it engagedby the earn-lever, an operating rod having a'socket in one end thereofand engaged by the upper end of the rod h, a s ring for actuating the oerating rod, an i et-vaive, an exhaustva ve, the

spring serving to open the inlet-valve when the cam-lever engages a[certain portion of the cam, and the rod 71 serving to open theexhaust-valve when the inlet-valve is closed and when the cam-leverengages another portion of therein, as described.

2. In combination with a earn-shaft of an internal combustion engine, acam thereon, a cam-lever as f, a roller as g engaging the earn, a red as7L engaged by the cam-lever, an operating rod having a socket in one endthereof and engaged by the upper end. of the rod 71 a spring foractuating the o erating rod, an i.nl.etvalve, an exhaust valve, thespring serving to open the inlet-valve when the cam-lever engages acertain portion of the cam, and the rod h serving to o pen the exhaustvalve when the inlet-valve is closed and when the cam-lever engagesanother portion of the earn, as described, the operating rod beingprovided with an opening therethrough, a rod as i'c, engaging theopening in the operating-rod, the operating spring encircling the rodis, its opposite ends engaging a shoulder as k and a part of theoperating-rod, as described.

CARL o. nEnsTRoMI Witnesses R. I. CLEMoNs, H. W. BOWEN.

